/* ==========================================================================
   Personal Portfolio Website Styles
   Author: SM Solayman Hossen Rokib
   ========================================================================== */

/* Self-hosted Web font: JetBrains Mono */
@font-face {
  font-family: 'JetBrains Mono';
  src: url('../JetBrainsMono-2.304/fonts/webfonts/JetBrainsMono-Regular.woff2') format('woff2');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'JetBrains Mono';
  src: url('../JetBrainsMono-2.304/fonts/webfonts/JetBrainsMono-SemiBold.woff2') format('woff2');
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'JetBrains Mono';
  src: url('../JetBrainsMono-2.304/fonts/webfonts/JetBrainsMono-Bold.woff2') format('woff2');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

/* Basic Reset */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'JetBrains Mono', monospace;
  line-height: 1.6;
  background-color: #f9f9f9;
  color: #333;
  margin: 0;
  padding: 0;
}

/* Modern accent palette using CSS variables */
:root {
  --accent: #671372;            /* provided modern purple */
  --accent-strong: #5b1066;     /* hover/active */
  --accent-soft-bg: rgba(103,19,114,0.10);
  --accent-soft-bg-hover: rgba(103,19,114,0.18);
  --accent-border: rgba(103,19,114,0.45);
  --accent-border-strong: rgba(103,19,114,0.65);
}

.dark-mode {
  --accent: #c870d4;            /* provided dark mode purple */
  --accent-strong: #b85fc6;     /* hover/active */
  --accent-soft-bg: rgba(200,112,212,0.16);
  --accent-soft-bg-hover: rgba(200,112,212,0.24);
  --accent-border: rgba(200,112,212,0.55);
  --accent-border-strong: rgba(200,112,212,0.78);
}

/* ==========================================================================
   Fixed Top Bar (3 links and Dark Mode Toggle)
   ========================================================================== */
.top-bar {
  position: fixed;
  top: 0;
  width: 100%;
  background: #fff;
  z-index: 9999;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.top-bar-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 20px;
}

.top-nav a {
  margin: 0 20px;
  border: 1px solid var(--accent);
  background: none;
  color: var(--accent);
  padding: 5px 10px;
  border-radius: 5px;
  text-decoration: none;
  font-weight: bold;
  transition: background 0.3s;
  font-size: 0.9rem;
}

.top-nav a:hover { background: var(--accent); color: #fff; }

/* Mark the current page as "active" */
.top-nav .active { background: var(--accent); color: #fff; }

/* ==========================================================================
   Main Layout
   ========================================================================== */
/* Main container needs top padding so content isn't hidden under the fixed header */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 100px 20px 20px;
}

/* Header Tile Container (60% / 40% split) */
.header-tile-container {
  display: flex;
  gap: 20px;
  margin-bottom: 20px;
  align-items: center;
}

.header-tile {
  width: 60%;
  background: #fff;
  padding: 20px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
  border-radius: 10px;
  transition: transform 0.3s, box-shadow 0.3s;
}

.header-tile:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 15px rgba(0,0,0,0.2);
}

/* ==========================================================================
   Profile Picture Section
   ========================================================================== */
/* Profile Picture Container (40%) */
.image-link-section {
  width: 40%;
  display: flex;
  gap: 20px;
  align-items: center;
  justify-content: center;
}

.image-section {
  width: 200px;
  height: 200px;
  background: transparent;
  padding: 0;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.image-section img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  /* Nudge the focal point upward so more headroom is visible */
  object-position: 50% 20%;
  border-radius: 10px;
}

/* ==========================================================================
   Header and Name Styling
   ========================================================================== */
.header-name {
  color: var(--accent);
  font-size: 1.3rem;
  margin-bottom: 0.5rem;
}

/* ==========================================================================
   Content Tiles (Sections)
   ========================================================================== */
.tile {
  background: #fff;
  padding: 20px;
  margin-bottom: 20px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
  border-radius: 10px;
  transition: transform 0.3s, box-shadow 0.3s;
}

.tile:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 15px rgba(0,0,0,0.2);
}

.tile h3 { color: var(--accent); margin-bottom: 10px; text-shadow: 0px 4px 6px rgba(103,19,114,0.2); }

/* Spacing for lists inside tiles */
.tile ul,
.tile ol {
  margin-left: 1.25rem;
}

.tile li { margin: 0.35rem 0; }

/* Publications page list */
.pub-list { list-style: decimal; padding-left: 1.25rem; }
.pub-note { font-size: 0.9rem; color: #666; margin-top: 0.5rem; }

/* ==========================================================================
   Social Icons
   ========================================================================== */
.social-icons {
  margin-top: 10px;
}

.social-icons a {
  margin: 0 10px;
  display: inline-block;
  width: 40px;
  height: 40px;
}

.social-icons img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
}

/* ==========================================================================
   Dark Mode Styles
   ========================================================================== */
.dark-mode {
  background-color: #121212;
  color: #e0e0e0;
}

.dark-mode .tile,
.dark-mode .header-tile,
.dark-mode .image-section {
  background: #1e1e1e;
  box-shadow: 0 0 10px rgba(255,255,255,0.1);
}

/* Make the profile image container transparent in dark mode too (no white frame) */
.dark-mode .image-section { background: transparent; }

.dark-mode a { color: var(--accent); }

.dark-mode .tile h3 { color: var(--accent); }

.dark-mode .top-nav a { border-color: var(--accent); color: var(--accent); }

.dark-mode .top-nav .active { background: var(--accent); color: #fff; }

.dark-mode .top-nav a:hover { background: var(--accent); color: #fff; }

.dark-mode .top-bar {
  background: #1e1e1e;
  box-shadow: 0 2px 10px rgba(255,255,255,0.1);
}

/* ==========================================================================
   Dark/Light Mode Toggle
   ========================================================================== */
/* Dark/Light Mode Toggle (Icon-based) placed in top bar */
#dark-mode-toggle {
  background: none;
  border: none;
  cursor: pointer;
}

#dark-mode-toggle img {
  width: 32px;
  height: 32px;
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
  display: inline-block;
  padding: 8px 14px;
  border-radius: 6px;
  text-decoration: none;
  font-weight: bold;
  border: 1px solid transparent;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

/* Compact button size */
.btn-sm {
  padding: 4px 10px;
  font-size: 0.82rem;
  border-radius: 5px;
  line-height: 1.1;
}

.btn-primary { background: var(--accent); color: #fff; border-color: var(--accent); box-shadow: 0 2px 6px rgba(103,19,114,0.25); }

.btn-primary.btn-sm { box-shadow: 0 1px 4px rgba(103,19,114,0.22); }

.btn-primary:hover { background: var(--accent-strong); border-color: var(--accent-strong); box-shadow: 0 3px 10px rgba(103,19,114,0.35); }

.btn-primary.btn-sm:hover { box-shadow: 0 2px 6px rgba(103,19,114,0.3); }

.dark-mode .btn-primary { background: var(--accent); color: #1e1e1e; border-color: var(--accent); box-shadow: 0 2px 6px rgba(127,42,140,0.25); }

.dark-mode .btn-primary.btn-sm { box-shadow: 0 1px 4px rgba(127,42,140,0.22); }

.dark-mode .btn-primary:hover { background: var(--accent-strong); border-color: var(--accent-strong); box-shadow: 0 3px 10px rgba(127,42,140,0.35); }

.dark-mode .btn-primary.btn-sm:hover { box-shadow: 0 2px 6px rgba(127,42,140,0.3); }

/* ==========================================================================
   Inline Link Chip (badge-style link like ChatGPT)
   ========================================================================== */
.link-chip {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  margin-left: 3px;
  padding: 0 5px;
  border-radius: 999px;
  font-size: 0.68rem; /* even more compact */
  line-height: 1;      /* minimal height */
  white-space: nowrap; /* prevent wrap */
  text-decoration: none;
  border: 1px solid var(--accent-border);
  color: var(--accent);
  background: var(--accent-soft-bg);
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
  vertical-align: middle;
}

.link-chip:hover { background: var(--accent-soft-bg-hover); border-color: var(--accent-border-strong); }

.dark-mode .link-chip { border-color: var(--accent-border); color: var(--accent); background: var(--accent-soft-bg); }
.dark-mode .link-chip:hover { background: var(--accent-soft-bg-hover); border-color: var(--accent-border-strong); }

/* ==========================================================================
   Blogs: Grid and Cards
   ========================================================================== */
.blog-grid {
  display: grid;
  grid-template-columns: repeat( auto-fill, minmax(260px, 1fr) );
  gap: 16px;
  margin-top: 16px;
}

.blog-card {
  display: block;
  background: #fff;
  border: 1px solid rgba(0,0,0,0.06);
  border-radius: 12px;
  text-decoration: none;
  color: inherit;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.blog-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 16px rgba(0,0,0,0.12);
  border-color: var(--accent-border);
}

.blog-card-content {
  padding: 16px;
}

.blog-card h4 {
  color: var(--accent);
  margin-bottom: 6px;
}

.blog-card .meta {
  font-size: 0.85rem;
  color: #666;
  margin-bottom: 8px;
}

.blog-card .excerpt {
  font-size: 0.95rem;
  color: #444;
  margin-bottom: 10px;
}

.tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tags span {
  font-size: 0.75rem;
  padding: 4px 8px;
  border-radius: 999px;
  background: var(--accent-soft-bg);
  color: var(--accent);
  border: 1px solid var(--accent-border);
}

.dark-mode .blog-card { background: #1e1e1e; border-color: rgba(255,255,255,0.08); box-shadow: 0 2px 8px rgba(255,255,255,0.06); }
.dark-mode .blog-card:hover { box-shadow: 0 10px 16px rgba(255,255,255,0.12); }
.dark-mode .blog-card .meta { color: #aaa; }
.dark-mode .blog-card .excerpt { color: #d0d0d0; }

/* ==========================================================================
  Small utility helpers
  ========================================================================== */
.section-title { margin-top: 14px; }
.indent { margin-left: 1.25rem; }
.mt-10 { margin-top: 10px; }
.mt-16 { margin-top: 16px; }
.light-hr { margin: 12px 0; opacity: 0.2; border: none; border-top: 1px solid currentColor; }

/* ==========================================================================
   Keyword chips bar (blog filters)
   ========================================================================== */
.keyword-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0 8px;
  align-items: center;
}

.keyword-chip {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--accent-border);
  background: var(--accent-soft-bg);
  color: var(--accent);
  border-radius: 999px;
  padding: 6px 10px;
  font-size: 0.86rem;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.keyword-chip:hover { background: var(--accent-soft-bg-hover); border-color: var(--accent-border-strong); }

.keyword-chip.active { background: var(--accent); border-color: var(--accent); color: #fff; box-shadow: 0 2px 8px rgba(103,19,114,0.28); }

.dark-mode .keyword-chip.active { color: #1e1e1e; box-shadow: 0 2px 8px rgba(127,42,140,0.28); }

/* A11y utility: visually hide content but keep it for screen readers */
.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}

/* Sort controls layout inside keyword bar */
#sort-controls { margin-left: auto; display: flex; align-items: center; gap: 8px; }
#sort-controls label { font-size: 0.9rem; color: inherit; }
#sort-controls select {
  padding: 6px 10px;
  border: 1px solid var(--accent-border);
  border-radius: 8px;
  background: var(--accent-soft-bg);
  color: inherit;
}

/* ==========================================================================
   Media grid (used for event photo strip)
   ==========================================================================
*/
.media-grid {
  display: grid;
  /* Exactly 3 tiles per row on desktop */
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin: 8px 0 16px;
}

.media-grid figure {
  background: #fff;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
  transition: transform 0.3s, box-shadow 0.3s;
  /* Make each tile a square */
  aspect-ratio: 1 / 1;
}

.media-grid figure:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 15px rgba(0,0,0,0.2);
}

.media-grid img {
  width: 100%;
  height: 100%;
  object-fit: cover; /* cover-cropped inside square */
  display: block;
  transition: transform 0.35s ease;
}

.media-grid figure:hover img { transform: scale(1.06); }

.media-grid figcaption {
  font-size: 0.85rem;
  padding: 6px 10px;
  color: #555;
}

.dark-mode .media-grid figure { background: #1e1e1e; box-shadow: 0 0 10px rgba(255,255,255,0.1); }
.dark-mode .media-grid figure:hover { box-shadow: 0 10px 15px rgba(255,255,255,0.18); }
.dark-mode .media-grid figcaption { color: #bbb; }

/* Responsive columns: 2 per row on tablets, 1 per row on phones */
@media (max-width: 900px) {
  .media-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 560px) {
  .media-grid { grid-template-columns: 1fr; }
}